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Opt Express. 2009 Jul 6;17(14):11236-45.

Threshold of a random laser based on Raman gain in cold atoms.

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1
Institut Non Linéaire de Nice, CNRS and Université de Nice Sophia-Antipolis, 06560 Valbonne, France. william.guerin@inln.cnrs.fr

Abstract

We address the problem of achieving a random laser with a cloud of cold atoms, in which gain and scattering are provided by the same atoms. In this system, the elastic scattering cross-section is related to the complex atomic polarizability. As a consequence, the random laser threshold is expressed as a function of this polarizability, which can be fully determined by spectroscopic measurements. We apply this idea to experimentally evaluate the threshold of a random laser based on Raman gain between non-degenerate Zeeman states and find a critical optical thickness on the order of 200, which is within reach of state-of-the-art cold-atom experiments.

PMID:
19582036
[Indexed for MEDLINE]
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